"if he starts giving ME the stare and growl" You don't give him the option. If he's biting and humping and generally freaking out energy wise, you need to walk right over, grab his scruff gently yet firmly and pull/lower him to his side. The scruff hand goes to the neck, and the other goes to the hip. Say the 'no' before you walk over, and be calm. Your calming him down, that's all. Remember that at his age he is NOT agresive with you. If he growls, it's not a 'real' growl, as in being truly aggressive. If he's staring at you, it's not being dominant, it's just being a obnoxious pup.
Edit to add. The stare and growl, to me, is reserved for a adult dog that understands. (I forgot how young he was when I said that...) I would not us this on Jersey tell he is older. With a pup, it's not needed. With an adult, like my D'Art who would hump when quiet a bit older then your boy, after a while he woulddin my mind start to get it. After you know the dog understands what's getting fussed (and the dog in question is older, at least five months or so) I do show of my anger more, namely in a focused stare and a deep throated 'growl' of there name normally. But for Jersey, lay him flat when he's going totally loco, and when a calmer mind, just verbally tell him off.
"if he starts to struggle really hard?" He will at first. Humping normally is done when a dog is really hyper, and you grabbing him will be, to him, play! You'll need to teach him that when he's held down, the only way to get up is it be still. Remember not to talk, give of any signs (put your poker face on) and don't have people hover around. If he struggles, spread your fingers and just focus on keeping him down, he'll go flat and relaxed on his own. If he flat out won't calm, keep holding his scruff instead of transferring your hand to his neck/shoulder area.
"once I do this once do you think he will be more inclined to respect me because right now I don't think he sees me as the leader yet." Your missing a important point here. He is a baby. You are his 'mother'. He is, in human years, what, 5? 6? Even seen a respectful 6 year old? lol. You won't get him acting like your the pack leader until he's older, more mature. In some ways I'm sure he does defer to you though, when scared, does he look to you? When hungry? when outside and he hears a bump in the night? More respect will come later. =) He will be obnoxious, testing, and flat out annoying for a good while, it's part of being a puppy! Don't think the fact that he's still taxing means your not firm enough, it means he's normal. If he was never annoying, he'd need a vet lol.
For biting, remember to keep with yelping, going poker face, standing and walking away, and closing the door behind you. Only with real persistent humping -or really hard biting after you've left once- would I think to pen him, he is just a baby. But it can be a great tool to get them to calm down, sometimes they can get so hyper they can't even control themselves lol.
How much exercise, both mental -training- and physical -walks- does he get daily? How much of his day is spent crated?